// :mode=c++:
/*
 decode.h - c++ wrapper for a base64 decoding algorithm

 This is part of the libb64 project, and has been placed in the public domain.
 For details, see http://sourceforge.net/projects/libb64
 */

#ifndef BASE64_DECODE_H
#define BASE64_DECODE_H

#include <iostream>
#include "cdecode.h"

namespace base64
{

struct decoder
{
	base64_decodestate _state;
	int _buffersize;

	decoder(int buffersize_in = 4096) :
		_buffersize(buffersize_in)
	{
	}
	int decode(char value_in)
	{
		return base64_decode_value(value_in);
	}
	int decode(const char* code_in, const int length_in, char* plaintext_out)
	{
		return base64_decode_block(code_in, length_in, plaintext_out, &_state);
	}
	void decode(std::istream& istream_in, std::ostream& ostream_in)
	{
		base64_init_decodestate(&_state);
		//
		const int N = _buffersize;
		char* code = new char[N];
		char* plaintext = new char[N];
		int codelength;
		int plainlength;

		do
		{
			istream_in.read((char*) code, N);
			codelength = istream_in.gcount();
			plainlength = decode(code, codelength, plaintext);
			ostream_in.write((const char*) plaintext, plainlength);
		} while (istream_in.good() && codelength > 0);
		//
		base64_init_decodestate(&_state);

		delete[] code;
		delete[] plaintext;
	}
};

} // namespace base64

#endif // BASE64_DECODE_H
